

; (function ($) {
    //自定义新增的属性options.clickMode，点击文本框即可触发下拉，但要和options.minChars=0连用
    //options.multipleSeparator options.multiple允许分格符多字段智能提示
    $.fn.extend({
        autocomplete: function (urlOrData, options) {
            var isUrl = typeof urlOrData == "function";
            options = $.extend({}, $.Autocompleter.defaults, {
                url: isUrl ? urlOrData : null,
                data: isUrl ? null : urlOrData,
                delay: isUrl ? $.Autocompleter.defaults.delay : 10,
                max: options && !options.scroll ? 10 : 150
            }, options);

            // if highlight is set to false, replace it with a do-nothing function
            options.highlight = options.highlight || function (value) { return value; };

            // if the formatMatch option is not specified, then use formatItem for backwards compatibility
            options.formatMatch = options.formatMatch || options.formatItem;

            return this.each(function () {
                new $.Autocompleter(this, options);
            });
        },
        result: function (handler) {
            return this.bind("result", handler);
        },
        search: function (handler) {
            return this.trigger("search", [handler]);
        },
        flushCache: function () {
            return this.trigger("flushCache");
        },
        setOptions: function (options) {
            return this.trigger("setOptions", [options]);
        },
        unautocomplete: function () {
            return this.trigger("unautocomplete");
        }
    });

    $.Autocompleter = function (input, options) {

        var KEY = {
            UP: 38,
            DOWN: 40,
            DEL: 46,
            TAB: 9,
            RETURN: 13,
            ESC: 27,
            COMMA: 188,
            PAGEUP: 33,
            PAGEDOWN: 34,
            BACKSPACE: 8
        };

        // Create $ object for input element
        var $input = $(input).attr("autocomplete", "off").addClass(options.inputClass);

        var timeout;
        var previousValue = "";
        var cache = $.Autocompleter.Cache(options);
        var hasFocus = 0;
        var lastKeyPressCode;
        var config = {
            mouseDownOnSelect: false
        };
        var select = $.Autocompleter.Select(options, input, selectCurrent, config);

        var blockSubmit;

        // prevent form submit in opera when selecting with return key
        $.browser.opera && $(input.form).bind("submit.autocomplete", function () {
            if (blockSubmit) {
                blockSubmit = false;
                return false;
            }
        });

        // only opera doesn't trigger keydown multiple times while pressed, others don't work with keypress at all
        var temclickstr = "";
        if (options.clickMode) {
            temclickstr = " click";
        }
        $input.bind("keyup", function (evnet) {
            //点击时记录光标位置
            var cursurPosition = -1;
            if (this.selectionStart != undefined) {//非IE浏览器
                cursurPosition = this.selectionStart;
            } else {//IE
                var range = document.selection.createRange();
                range.moveStart("character", -this.value.length);
                cursurPosition = range.text.length;
            }
            $(this).attr("pointAt", cursurPosition);
        });
        $input.bind(($.browser.opera ? "keypress" + temclickstr : "keydown" + temclickstr) + ".autocomplete", function (event) {
            // a keypress means the input has focus
            // avoids issue where input had focus before the autocomplete was applied
            hasFocus = 1;
            // track last key pressed
            lastKeyPressCode = event.keyCode;
            switch (event.keyCode) {

                case KEY.UP:
                    event.preventDefault();
                    if (select.visible()) {
                        select.prev();
                    } else {
                        onChange(0, true);
                    }
                    break;

                case KEY.DOWN:
                    event.preventDefault();
                    if (select.visible()) {
                        select.next();
                    } else {
                        //处理直接按向下键列出默认的数据（从0改成1了）
                        onChange(1, true);
                    }
                    break;

                case KEY.PAGEUP:
                    event.preventDefault();
                    if (select.visible()) {
                        select.pageUp();
                    } else {
                        onChange(0, true);
                    }
                    break;

                case KEY.PAGEDOWN:
                    event.preventDefault();
                    if (select.visible()) {
                        select.pageDown();
                    } else {
                        onChange(0, true);
                    }
                    break;

                    // matches also semicolon
                case options.multiple && $.trim(options.multipleSeparator) == "," && KEY.COMMA:
                case KEY.TAB:
                case KEY.RETURN:
                    if (selectCurrent()) {
                        // stop default to prevent a form submit, Opera needs special handling
                        event.preventDefault();
                        blockSubmit = true;
                        return false;
                    }
                    break;

                case KEY.ESC:
                    select.hide();
                    break;

                default:
                    clearTimeout(timeout);
                    timeout = setTimeout(onChange, options.delay);
                    break;
            }
        }).focus(function () {
            // track whether the field has focus, we shouldn't process any
            // results if the field no longer has focus
            hasFocus++;
        }).blur(function () {
            hasFocus = 0;
        }).click(function () {
            // show select when clicking in a focused field
            if (hasFocus++ > 1 && !select.visible()) {
                onChange(0, true);
            }
        }).bind("search", function () {
            // TODO why not just specifying both arguments?
            var fn = (arguments.length > 1) ? arguments[1] : null;
            function findValueCallback(q, data) {
                var result;
                if (data && data.length) {
                    for (var i = 0; i < data.length; i++) {
                        if (data[i].result.toLowerCase() == q.toLowerCase()) {
                            result = data[i];
                            break;
                        }
                    }
                }
                if (typeof fn == "function") fn(result);
                else $input.trigger("result", result && [result.data, result.value]);
            }
            $.each(trimWords($input.val()), function (i, value) {
                request(value, findValueCallback, findValueCallback);
            });
        }).bind("flushCache", function () {
            cache.flush();
        }).bind("setOptions", function () {
            $.extend(options, arguments[1]);
            // if we've updated the data, repopulate
            if ("data" in arguments[1])
                cache.populate();
        }).bind("unautocomplete", function () {
            select.unbind();
            $input.unbind();
            $(input.form).unbind(".autocomplete");
        });


        function selectCurrent() {
            var selected = select.selected();
            if (!selected)
                return false;

            var v = selected.result;
            //if (v == "从栋座单元中搜索") {

            //onChange(0, true,v);
            // return;
            //}
            previousValue = v;

            if (options.multiple) {
                var words = trimWords($input.val());
                if (words.length > 1) {
                    var seperator = options.multipleSeparator.length;
                    //原来方式是在选择时判断光标在文本框的位置,可是IE10以下浏览器,如果文本框焦点失效后,并不记录上次光标位置,导致取不到数据
                    //var cursorAt = $(input).selection().start;
                    //所以在文本框每次任意事件时,将光标位置取出放到文本框pointAt属性中
                    var cursorAt = $(input).attr("pointAt");
                    var wordAt, progress = 0;
                    $.each(words, function (i, word) {
                        progress += word.length;
                        if (cursorAt <= progress) {
                            wordAt = i;
                            return false;
                        }
                        progress += seperator;
                    });
                    words[wordAt] = v;
                    // TODO this should set the cursor to the right position, but it gets overriden somewhere
                    //$.Autocompleter.Selection(input, progress + seperator, progress + seperator);
                    v = words.join(options.multipleSeparator);
                }
                //是否默认加上分隔符
                //v += options.multipleSeparator;
            }

            if (options.weiboMode) {
                $input.val(options.beforText + v + options.afterText);
            }
            else {
                $input.val(v);
            }
            hideResultsNow();
            $input.trigger("result", [selected.data, selected.value]);
            return true;
        }

        function onChange(crap, skipPrevCheck, currentSelect) {
            if (lastKeyPressCode == KEY.DEL) {
                select.hide();
                return;
            }
            var currentValue = $input.val();
            if (!options.clickMode) {
                if (!skipPrevCheck && currentValue == previousValue)
                    return;
            }
            if (options.weiboMode) {
                var pos = $(input).getCursorPosition();
                var preval = input.value.substr(0, pos);
                var atpos = preval.lastIndexOf('@');
                if (atpos >= 0) {
                    var atval = preval.substring(atpos + 1, pos);
                    mousepos = $(input).getCaretPosition();
                    options.mousepos = mousepos;
                    options.beforText = preval.substring(0, atpos);
                    options.afterText = input.value.substr(pos);
                }
                if (atval && atval.length < 20) {
                    if (atval.match(/[^\u4e00-\u9fa5\w@_-]/g)) {//匹配@后面有哪些内容时不出现提示
                        select.hide();
                        return;
                    } else {
                        currentValue = atval;
                    }
                } else {
                    select.hide();
                    return;
                }
            }


            previousValue = currentValue;

            currentValue = lastWord(currentValue);
            if (currentValue.length >= options.minChars) {
                $input.addClass(options.loadingClass);
                if (!options.matchCase)
                    currentValue = currentValue.toLowerCase();
                request(currentValue, receiveData, hideResultsNow, currentSelect);
            }
            //新增的判断，处理按向下键出现默认数据
            else if (crap == options.minChars) {
                request(currentValue, receiveData, hideResultsNow, currentSelect);
            }
            else {
                stopLoading();
                select.hide();
            }
        };

        function trimWords(value) {
            if (!value)
                return [""];
            if (!options.multiple)
                return [$.trim(value)];
            return $.map(value.split(options.multipleSeparator), function (word) {
                return $.trim(value).length ? $.trim(word) : null;
            });
        }

        function lastWord(value) {
            if (!options.multiple)
                return value;
            var words = trimWords(value);
            if (words.length == 1)
                return words[0];
            var cursorAt = $(input).selection().start;
            if (cursorAt == value.length) {
                words = trimWords(value)
            } else {
                words = trimWords(value.replace(value.substring(cursorAt), ""));
            }
            return words[words.length - 1] || "";
        }

        // fills in the input box w/the first match (assumed to be the best match)
        // q: the term entered
        // sValue: the first matching result
        function autoFill(q, sValue) {
            // autofill in the complete box w/the first match as long as the user hasn't entered in more data
            // if the last user key pressed was backspace, don't autofill
            if (options.autoFill && (lastWord($input.val()).toLowerCase() == q.toLowerCase()) && lastKeyPressCode != KEY.BACKSPACE) {
                // fill in the value (keep the case the user has typed)
                $input.val($input.val() + sValue.substring(lastWord(previousValue).length));
                // select the portion of the value not typed by the user (so the next character will erase)
                $(input).selection(previousValue.length, previousValue.length + sValue.length);
            }
        };

        function hideResults() {
            clearTimeout(timeout);
            timeout = setTimeout(hideResultsNow, 200);
        };

        function hideResultsNow() {
            var wasVisible = select.visible();
            select.hide();
            clearTimeout(timeout);
            stopLoading();
            if (options.mustMatch) {
                // call search and run callback
                $input.search(
                    function (result) {
                        // if no value found, clear the input box
                        if (!result) {
                            if (options.multiple) {
                                var words = trimWords($input.val()).slice(0, -1);
                                $input.val(words.join(options.multipleSeparator) + (words.length ? options.multipleSeparator : ""));
                            }
                            else {
                                $input.val("");
                                $input.trigger("result", null);
                            }
                        }
                    }
                );
            }
        };

        function receiveData(q, data) {
            if (data && data.length && hasFocus) {
                stopLoading();
                select.display(data, q);
                autoFill(q, data[0].value);
                select.show();

            } else {
                hideResultsNow();
            }
        };

        function request(term, success, failure, selectCurrent) {
            options.onchange && options.onchange();
            //这个参数没用了，后面的代码已经全小写匹配了
            if (!options.matchCase)
                term = term.toLowerCase();
            var data = cache.load(term);
            // recieve the cached data
            if (data && data.length) {
                success(term, data);
                // if an AJAX url has been supplied, try loading the data now
            } else if ((typeof options.url == "function") && (options.url($input[0]).length > 0)) {

                var extraParams = {
                    timestamp: +new Date()
                };
                $.each(options.extraParams, function (key, param) {
                    extraParams[key] = typeof param == "function" ? param() : param;
                });

                $.ajax({
                    // try to leverage ajaxQueue plugin to abort previous requests
                    mode: "abort",
                    // limit abortion to this input
                    port: "autocomplete" + input.name,
                    dataType: "json",
                    url: options.url($input[0], selectCurrent),
                    data: $.extend({
                        q: lastWord(term),
                        limit: options.max
                    }, extraParams),
                    error: function (e) {
                       // var str = e.status + ":" + e.statusText;
                       // if ($("#ajaxError").length > 0) {
                      //      $("#ajaxError").html("ajax错误:" + str);
                       // }
                    },
                    success: function (data) {
                        var parsed = options.parse && options.parse(data) || parse(data);
                        cache.add(term, parsed);
                        //如果发送的字符串和现在的相等，则显示结果，如果有+号，则和最后+号相等
                        if (lastWord(term) == lastWord($input.val().toLowerCase())) {
                            success(term, parsed);
                        }
                    }
                });
            } else {
                // if we have a failure, we need to empty the list -- this prevents the the [TAB] key from selecting the last successful match
                select.emptyList();
                failure(term);
            }
        };

        function parse(data) {
            var parsed = [];
            var rows = data;
            //修改过加了if判断，否则rows会出现null值
            if (rows) {
                for (var i = 0; i < rows.length; i++) {
                    var row = rows[i];
                    if (row) {
                        parsed[parsed.length] = {
                            data: row,
                            value: row,
                            result: options.formatResult && options.formatResult(row) || row
                        };
                    }
                }
                return parsed;
            }
            return '';
        };

        function stopLoading() {
            $input.removeClass(options.loadingClass);
        };

    };

    $.Autocompleter.defaults = {
        inputClass: "ac_input",
        resultsClass: "ac_results",
        loadingClass: "ac_loading",
        minChars: 1,
        delay: 400,
        matchCase: false,
        matchSubset: true,
        matchContains: false,
        cacheLength: 10,
        max: 100,
        mustMatch: false,
        extraParams: {},
        selectFirst: true,
        formatItem: function (row) { return row; },
        formatMatch: null,
        autoFill: false,
        width: 0,
        multiple: false,
        multipleSeparator: ", ",
        highlight: function (value, term) {
            return value.replace(new RegExp("(?![^&;]+;)(?!<[^<>]*)(" + term.replace(/([\^\$\(\)\[\]\{\}\*\.\+\?\|\\])/gi, "\\$1") + ")(?![^<>]*>)(?![^&;]+;)", "gi"), "<strong>$1</strong>");
        },
        scroll: true
        //scrollHeight: 215
    };

    $.Autocompleter.Cache = function (options) {

        var data = {};
        var length = 0;

        function matchSubset(s, sub) {
            if (!options.matchCase)
                s = options.formatItem(s);
            var i = s.indexOf(sub);
            if (options.matchContains == "word") {
                i = s.toLowerCase().search("\\b" + sub.toLowerCase());
            }
            if (i == -1) return false;
            return i == 0 || options.matchContains;
        };

        function add(q, value) {
            if (length > options.cacheLength) {
                flush();
            }
            if (!data[q]) {
                length++;
            }
            data[q] = value;
        }

        function populate() {
            if (!options.data) return false;
            // track the matches
            var stMatchSets = {},
                nullData = 0;

            // no url was specified, we need to adjust the cache length to make sure it fits the local data store
            if (!options.url) options.cacheLength = 1;

            // track all options for minChars = 0
            stMatchSets[""] = [];

            // loop through the array and create a lookup structure
            for (var i = 0, ol = options.data.length; i < ol; i++) {
                var rawValue = options.data[i];
                // if rawValue is a string, make an array otherwise just reference the array
                rawValue = (typeof rawValue == "string") ? [rawValue] : rawValue;

                var value = options.formatMatch(rawValue, i + 1, options.data.length);
                if (value === false)
                    continue;

                var firstChar = value.charAt(0).toLowerCase();
                // if no lookup array for this character exists, look it up now
                if (!stMatchSets[firstChar])
                    stMatchSets[firstChar] = [];

                // if the match is a string
                var row = {
                    value: value,
                    data: rawValue,
                    result: options.formatResult && options.formatResult(rawValue) || value
                };

                // push the current match into the set list
                stMatchSets[firstChar].push(row);

                // keep track of minChars zero items
                if (nullData++ < options.max) {
                    stMatchSets[""].push(row);
                }
            };

            // add the data items to the cache
            $.each(stMatchSets, function (i, value) {
                // increase the cache size
                options.cacheLength++;
                // add to the cache
                add(i, value);
            });
        }

        // populate any existing data
        setTimeout(populate, 25);

        function flush() {
            data = {};
            length = 0;
        }

        return {
            flush: flush,
            add: add,
            populate: populate,
            load: function (q) {
                if (!options.cacheLength || !length)
                    return null;
                /* 
                 * if dealing w/local data and matchContains than we must make sure
                 * to loop through all the data collections looking for matches
                 */
                if (!options.url && options.matchContains) {
                    // track all matches
                    var csub = [];
                    // loop through all the data grids for matches
                    for (var k in data) {
                        // don't search through the stMatchSets[""] (minChars: 0) cache
                        // this prevents duplicates
                        if (k.length > 0) {
                            var c = data[k];
                            $.each(c, function (i, x) {
                                // if we've got a match, add it to the array
                                if (matchSubset(x.value, q)) {
                                    csub.push(x);
                                }
                            });
                        }
                    }
                    return csub;
                } else
                    // if the exact item exists, use it
                    if (data[q]) {
                        return data[q];
                    } else
                        if (options.matchSubset) {
                            for (var i = q.length - 1; i >= options.minChars; i--) {
                                var c = data[q.substr(0, i)];
                                if (c) {
                                    var csub = [];
                                    $.each(c, function (i, x) {
                                        if (matchSubset(x.value, q)) {
                                            csub[csub.length] = x;
                                        }
                                    });
                                    return csub;
                                }
                            }
                        }
                return null;
            }
        };
    };

    $.Autocompleter.Select = function (options, input, select, config) {
        var CLASSES = {
            ACTIVE: "ac_over"
        };

        var listItems,
            active = -1,
            data,
            term = "",
            needsInit = true,
            element,
            list;

        // Create results
        function init() {
            if (!needsInit)
                return;
            element = $("<div/>")
            .hide()
            .addClass(options.resultsClass)
            .css("position", "absolute")
            .appendTo(document.body);
            list = $("<ul/>").appendTo(element).mouseover(function (event) {
                if (target(event).nodeName && target(event).nodeName.toUpperCase() == 'LI') {
                    active = $("li", list).removeClass(CLASSES.ACTIVE).index(target(event));
                    $(target(event)).addClass(CLASSES.ACTIVE);
                }
            }).click(function (event) {
                $(target(event)).addClass(CLASSES.ACTIVE);
                $(input).focus();
                select();
                // TODO provide option to avoid setting focus again after selection? useful for cleanup-on-focus


                return false;
            }).mousedown(function () {
                config.mouseDownOnSelect = true;
            }).mouseup(function () {
                config.mouseDownOnSelect = false;
            });
            if (options.width > 0)
                //element.css("width", options.width);

                needsInit = false;
        }

        function target(event) {
            var element = event.target;
            while (element && element.tagName != "LI")
                element = element.parentNode;
            // more fun with IE, sometimes event.target is empty, just ignore it then
            if (!element)
                return [];
            return element;
        }

        function moveSelect(step) {
            listItems.slice(active, active + 1).removeClass(CLASSES.ACTIVE);
            movePosition(step);
            var activeItem = listItems.slice(active, active + 1).addClass(CLASSES.ACTIVE);
            if (options.scroll) {
                var offset = 0;
                listItems.slice(0, active).each(function () {
                    offset += this.offsetHeight;
                });
                if ((offset + activeItem[0].offsetHeight - list.scrollTop()) > list[0].clientHeight) {
                    list.scrollTop(offset + activeItem[0].offsetHeight - list.innerHeight());
                } else if (offset < list.scrollTop()) {
                    list.scrollTop(offset);
                }
            }
        };

        function movePosition(step) {
            active += step;
            if (active < 0) {
                active = listItems.size() - 1;
            } else if (active >= listItems.size()) {
                active = 0;
            }
        }

        function limitNumberOfItems(available) {
            return options.max && options.max < available
                ? options.max
                : available;
        }

        function fillList() {
            list.empty();
            var max = limitNumberOfItems(data.length);
            for (var i = 0; i < max; i++) {
                if (!data[i])
                    continue;
                var formatted = options.formatItem(data[i].data, i + 1, max, data[i].value, term);
                if (formatted === false)
                    continue;
                var li = $("<li/>").html(options.highlight(formatted, term)).addClass(i % 2 == 0 ? "ac_even" : "ac_odd").appendTo(list)[0];
                $.data(li, "ac_data", data[i]);
            }
            listItems = list.find("li");
            if (options.selectFirst) {
                listItems.slice(0, 1).addClass(CLASSES.ACTIVE);
                active = 0;
            }
            // apply bgiframe if available
            if ($.fn.bgiframe)
                list.bgiframe();
        }


        return {
            display: function (d, q) {
                init();
                data = d;
                term = q;
                fillList();
            },
            next: function () {
                moveSelect(1);
            },
            prev: function () {
                moveSelect(-1);
            },
            pageUp: function () {
                if (active != 0 && active - 8 < 0) {
                    moveSelect(-active);
                } else {
                    moveSelect(-8);
                }
            },
            pageDown: function () {
                if (active != listItems.size() - 1 && active + 8 > listItems.size()) {
                    moveSelect(listItems.size() - 1 - active);
                } else {
                    moveSelect(8);
                }
            },
            hide: function () {
                element && element.hide();
                listItems && listItems.removeClass(CLASSES.ACTIVE);
                active = -1;
            },
            visible: function () {
                return element && element.is(":visible");
            },
            current: function () {
                return this.visible() && (listItems.filter("." + CLASSES.ACTIVE)[0] || options.selectFirst && listItems[0]);
            },
            show: function () {
                var offset = $(input).offset();
                var weibotop = weiboleft = 0;
                if (options.mousepos) {
                    element.css({
                        //width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
                        top: offset.top + options.mousepos.top,
                        left: offset.left + options.mousepos.left
                    }).show();
                }
                else {
                    element.css({
                        //width: typeof options.width == "string" || options.width > 0 ? options.width : $(input).width(),
                        top: offset.top + input.offsetHeight,
                        left: offset.left
                    }).show();
                }

                if (options.scroll) {
                    list.scrollTop(0);
                    list.css({
                        maxHeight: options.scrollHeight,
                        overflow: 'auto'
                    });

                    if ($.browser.msie && typeof document.body.style.maxHeight === "undefined") {
                        var listHeight = 0;
                        listItems.each(function () {
                            listHeight += this.offsetHeight;
                        });
                        var scrollbarsVisible = listHeight > options.scrollHeight;
                        list.css('height', scrollbarsVisible ? options.scrollHeight : listHeight);
                        if (!scrollbarsVisible) {
                            // IE doesn't recalculate width when scrollbar disappears
                            listItems.width(list.width() - parseInt(listItems.css("padding-left")) - parseInt(listItems.css("padding-right")));
                        }
                    }
                }
                var autocompleteOuterclick = function (e) {
                    var tempoint = element.offset();
                    if (e.pageX > (tempoint.left + element.width()) || e.pageX < tempoint.left || e.pageY > (tempoint.top + element.height()) || e.pageY < tempoint.top) {
                        if (e.target != input) {
                            element.hide();
                            $(document).unbind("click", autocompleteOuterclick);
                        }
                    }
                };
                //赵贲,修改了选择框的隐藏方式,原来是通过burl
                $(document).unbind("click", autocompleteOuterclick);
                $(document).bind("click", autocompleteOuterclick);
            },
            selected: function () {
                var selected = listItems && listItems.filter("." + CLASSES.ACTIVE).removeClass(CLASSES.ACTIVE);
                return selected && selected.length && $.data(selected[0], "ac_data");
            },
            emptyList: function () {
                list && list.empty();
            },
            unbind: function () {
                element && element.remove();
            }
        };
    };

    $.fn.selection = function (start, end) {
        if (start !== undefined) {
            return this.each(function () {
                if (this.createTextRange) {
                    var selRange = this.createTextRange();
                    if (end === undefined || start == end) {
                        selRange.move("character", start);
                        selRange.select();
                    } else {
                        selRange.collapse(true);
                        selRange.moveStart("character", start);
                        selRange.moveEnd("character", end);
                        selRange.select();
                    }
                } else if (this.setSelectionRange) {
                    this.setSelectionRange(start, end);
                } else if (this.selectionStart) {
                    this.selectionStart = start;
                    this.selectionEnd = end;
                }
            });
        }
        var field = this[0];
        if (field.createTextRange && document.selection) {
            var range = document.selection.createRange(),
                orig = field.value,
                teststring = "<->",
                textLength = range.text.length;
            range.text = teststring;
            var caretAt = field.value.indexOf(teststring);
            field.value = orig;
            this.selection(caretAt, caretAt + textLength);
            return {
                start: caretAt,
                end: caretAt + textLength
            }
        } else if (field.selectionStart !== undefined) {
            return {
                start: field.selectionStart,
                end: field.selectionEnd
            }
        }
    };

})(jQuery);
//weibo模式代码
; $(function () {
    var calculator = {
        // key styles
        primaryStyles: ['fontFamily', 'fontSize', 'fontWeight', 'fontVariant', 'fontStyle',
            'paddingLeft', 'paddingTop', 'paddingBottom', 'paddingRight',
            'marginLeft', 'marginTop', 'marginBottom', 'marginRight',
            'borderLeftColor', 'borderTopColor', 'borderBottomColor', 'borderRightColor',
            'borderLeftStyle', 'borderTopStyle', 'borderBottomStyle', 'borderRightStyle',
            'borderLeftWidth', 'borderTopWidth', 'borderBottomWidth', 'borderRightWidth',
            'lineHeight', 'outline'],

        specificStyle: {
            'word-wrap': 'break-word',
            'overflow-x': 'hidden',
            'overflow-y': 'auto'
        },

        simulator: $('<div id="textarea_simulator"/>').css({
            position: 'absolute',
            backgroundColor: 'red',
            top: 0,
            left: 0,
            visibility: 'visible'
        }).appendTo(document.body),

        toHtml: function (text) {
            return text.replace(/\n/g, '<br>')
                .split(' ').join('<span style="white-space:prev-wrap">&nbsp;</span>');
        },
        // calculate position 
        getCaretPosition: function () {
            var cal = calculator, self = this, element = self[0], elementOffset = self.offset();

            // IE has easy way to get caret offset position
            /*if ($.browser.msie) {
                // must get focus first
                element.focus();
                var range = document.selection.createRange();  
                $('#hskeywords').val(element.scrollTop);
                return {  
                    left: range.boundingLeft - elementOffset.left,
                    top: parseInt(range.boundingTop) - elementOffset.top + element.scrollTop 
                        + document.documentElement.scrollTop + parseInt(self.getComputedStyle("fontSize")) 
                };  
            }  
*/            cal.simulator.empty();
            // clone primary styles to imitate textarea
            $.each(cal.primaryStyles, function (index, styleName) {
                self.cloneStyle(cal.simulator, styleName);
            });

            // caculate width and height
            cal.simulator.css($.extend({
                //'width': self.width(),
                'height': self.height()
            }, cal.specificStyle));

            var value = self.val(), cursorPosition = self.getCursorPosition();
            var beforeText = value.substring(0, cursorPosition);
            atpos = beforeText.lastIndexOf('@');
            if (atpos != -1) {
                beforeText = beforeText.substring(0, atpos);
                afterText = value.substring(atpos);
                self.attr("beforeText", beforeText);
                self.attr("afterText", afterText);
            } else {
                afterText = value.substring(cursorPosition);
            }
            var before = $('<span class="before"/>').html(cal.toHtml(beforeText)),
                focus = $('<span class="focus"/>'),
                after = $('<span class="after"/>').html(cal.toHtml(afterText));

            cal.simulator.append(before).append(focus).append(after);
            var focusOffset = focus.offset(), simulatorOffset = cal.simulator.offset();
            // alert(focusOffset.left  + ',' +  simulatorOffset.left + ',' + element.scrollLeft);
            return {
                top: focusOffset.top - simulatorOffset.top - element.scrollTop
                    // calculate and add the font height except Firefox
                    + (parseInt(self.getComputedStyle("lineHeight"))),
                left: focus[0].offsetLeft// -  cal.simulator[0].offsetLeft - element.scrollLeft
            };
        }
    };

    $.fn.extend({
        getComputedStyle: function (styleName) {
            if (this.length == 0) return;
            var thiz = this[0];
            var result = this.css(styleName);
            result = result || ($.browser.msie ?
                thiz.currentStyle[styleName] :
                document.defaultView.getComputedStyle(thiz, null)[styleName]);
            return result;
        },
        // easy clone method  这个地方很容易出问题,比较行高,可能会将倍数转为象素
        cloneStyle: function (target, styleName) {
            var styleVal = this.getComputedStyle(styleName);
            if (!!styleVal) {
                $(target).css(styleName, styleVal);
            }
        },
        cloneAllStyle: function (target, style) {
            var thiz = this[0];
            for (var styleName in thiz.style) {
                var val = thiz.style[styleName];
                typeof val == 'string' || typeof val == 'number'
                    ? this.cloneStyle(target, styleName)
                    : NaN;
            }
        },
        getCursorPosition: function () {
            var thiz = this[0], result = 0;
            if ('selectionStart' in thiz) {
                result = thiz.selectionStart;
            } else if ('selection' in document) {
                var range = document.selection.createRange();
                if (parseInt($.browser.version) > 6) {
                    thiz.focus();
                    var length = document.selection.createRange().text.length;
                    range.moveStart('character', -thiz.value.length);
                    result = range.text.length - length;
                } else {
                    var bodyRange = document.body.createTextRange();
                    bodyRange.moveToElementText(thiz);
                    for (; bodyRange.compareEndPoints("StartToStart", range) < 0; result++)
                        bodyRange.moveStart('character', 1);
                    for (var i = 0; i <= result; i++) {
                        if (thiz.value.charAt(i) == '\n')
                            result++;
                    }
                    var enterCount = thiz.value.split('\n').length - 1;
                    result -= enterCount;
                    return result;
                }
            }
            return result;
        },
        getCaretPosition: calculator.getCaretPosition
    });
});